“United in diversity” is the slogan of the European Union. The European Union is the largest integration that brings together different states and peoples. In addition to the common goals of the Union, it respects each member state and accepts its national identity, culture, history, language, religion, and its needs and desires. Its emergence preceded the desire to end international hate and rivalry in Europe and to build the foundation for maintaining peace between the former hostile parties. The European Union today is a community of 28 member states. Enlargement is done by concluding accession treaties, which change the founding treaties in terms of the composition of institutions and decision-making in these institutions. Through its European Neighborhood Policy (ENP), which was reviewed in November 2015, the European Union is working with its southern and eastern neighboring countries to promote stability, security and prosperity in line with the Global Strategy for Foreign and Security Policy European Union.